2. Troubleshooting
29
The deceleration time is too long even with the Dynamic Breaking resistor connected to the
motor.
The deceleration time is set too long.
Change the setting accordingly.
The motor torque is insufficient.
If there is no problem with motor parameters, this is due to
motor capacity. Replace the motor with a bigger capacity.
The load is higher than the internal torque limit
(based on the rated current) of the inverter..
Replace the inverter with a bigger capacity.
It is difficult to operate at under load applications.
The carrier frequency is too high.
Reduce the carrier frequency in code H39.
Inaccurate V/F value at low speed caused over-
excitation.
Reduce the torque boost value to avoid over-excitation.
The control unit is not working or noise is generated when the inverter is in operation.
The switching inside the inverter caused noise.
Reduce the carrier frequency in code H39.
Install a micro surge filer in the inverter output.
The earth leakage breaker is activated when the inverter is in operation.
The earth leakage breaker is activated due to
leaking current from the inverter.
Connect the inverter to the ground terminal.
Check the ground resistance is less than 100 Ω for 200V
and less than 10 Ω for 400V inverters.
Check the capacity of the leakage breaker and connect
properly based on the rated current of the inverter.
Reduce the carrier frequency in code H39.
Make the cable length between the inverter and the motor
as short as possible.
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